100 metre long train remaining at a speed of 48 km per hour passes a tunnel in 21 seconds. let us calculate the length of the tunnel
Answers
Answered by
3
Answer:
The bridge is 300 meters long.
➡At 48 km/h the train goes 48000 meters in one hour.
➡ That means that it travels 48000 meters in 3600 seconds; which is equal to 13 and 1/3 meters per second.
➡With that speed it takes 100 /13,333 seconds to go the whole length of the train; 100 meters. 100/13,333 is equal to 7,5 almost exactly.
➡Then, divide 30 seconds with 7,5, and you get how many ‘train-lengths’ you travel in that sequence. 30 divided by 7,5 is exactly 4.
➡Reduce 1 from 4 and you get 3. 3 train-lengths is the length of the bridge, which is equal to 300 meters.
Similar questions